Ahojew b



:NO Model.) 2 Sheets-sheet 1.

, F. W. MIX.

LOCK.

No. 551,584. V Patented D55. 17, 1895 MIN (No Model.) 2 sheets-sheen 2.

'1:'. W. MIX.

LOCK.

` N0.551,684. l Patented Dec.17,1895.

l V////////////// f Finca.

i ATENT FRANK W. MIX, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE & TOIVNE MANUFACTURING COMPANY, OF SAME PLACE.

LOCK.

SPECIFICATION forming part of Letters Patent No. 551,684, dated December 17, 1895.

Application filed February 2, 1894. Serial No. 498,864. (No model.)

To all whom t may concern:

Be it known that I, FRANK W. MIX, a citizen of the United States, residing at Stamford, in the county of Faireld and State of Connecticut, have invented a certain new and useful Improvement in Locks, of which the following specification is a full, clear, and exact description.

My invention relates to mortise-locks provided with a revoluble plug for guiding the key.

In my invention the revoluble key-plug is separable from the lock-case in which the locking mechanism is contained, and has an inner bearing in said lock-case and an outer bearing in an independent escutcheon or sleeve, as hereinafter described.

My invention also relates to means for adjusting the key-plug -to different thicknesses of wood without detracting from the appearance of the lock when it is in place. Heretofore adj ustability has been obtained by an escutcheon y containing an inner cylinder which is provided with a guide or bearing eX- tending into and sometimes through the lockcase. In such locks the key-cylinder or guide was attached to the escutcheon so that when the escutcheon was removed the entire cylinder came out and left a large hole directly into the lock-oase, which materially decreased the security of the lock.

My present improvements provide a support and guide for the key which can be attached to mortise-locks even where the tumbler mechanism is contained within thelockcase, and an exterior escutcheon which may project slightly beyond the key-plug or be iiush with it.

In order that my invention may be fully understood I will first describe the same with reference to the accompanying drawings, and afterward more particularly point out the novelty in the annexed claims.

In the drawingsI have shown my improvements applied to a peculiar construction of mortise-locks, but it is obvious that the size, style or purpose of the lock has nothing to do with the scope of the invention.

In said drawings,V Figure 1 is a front perspective view of a lock having my improvements applied. Fig. 2 is a front view of the tional view showing the construction of the 6o key-plug and escutcheon. Fig. Sis a detail view of the front plate of the lock-case, showing the means for securing the detachable key-plug in position.

1 and 2 are spring-locking hooks journaled 65 upon the posts 3 and et.

5 is the station-ary mortise-bolt projecting from' the lock-case, and 6 is the movable acttuating slide which retracts the hooks 1 and 2 when the spring-tumblers 7 are moved into 7o position to receive the stump 8 carried by the slide.

10 is the improved key-plug consisting of a cylindrical body having a bearing 11 in the rear plate of the lock-case and a bearing 12 75 in the front plate of the look-case.

18 is the slot for the reception of the key. 14 is an annular groove just outside of the front plate of the lock-case, and 15 is a slideplate provided with a pin 16, which projects 8o through the slot 17 of the lock-case for guiding the plate in its movement. The pin 16 is headed to keep itin position. 18 is a spring secured to the lock-case and engaging the inturned lip 19 of the slide so as to give it an 8 5 outward tendency.

2O is a screw seated in the edge plate of the `lock-case and engaging the lip 19 of the slide. The slide is adapted to engage in the groove 14. of the plug for holding the plug in place 9o after it is inserted in the lock. These details of construction may be varied without departing from the spirit of my invention.

As a nish, and to give the plug adjustability to different thicknesses of wood, I pro- 9 5 vide an exterior escutcheon 21 surrounding the plug 10. The plug may project slightly beyond the face of the escutcheon or it may rest considerably inside of the face of the escntcheon withoutdetracting from the appear- 1o@ ance of the lock, and at the same time all of the required adjustability is obtained.

Fig. 5 is a 55 From my improved construction it is cvident that the key-plug is a part of the lockcase and cannot be removed until the lock is unlocked and access is had to the set-screw.

I am aware that it has been proposed to attach a removable keyplug to rinrlocks by means of detachable plates or keys, but in this construction it is necessary to remove the lock from the door before the key-plug can be detached. I am also aware that cylinders containing the tumbler mechanism and keyplug have been dctachably secured to lockcases through suitable means operated from the edge plate; but I am not aware that it has ever been proposed to provide a mortiselock having the tumbler mechanism within the lcck-case with a removable key-plug which is detachably secured directly to the loclecase and is free to revolve thereon and which can be detached from' the lock-ease through suitable means operated from the edge plate, whereby it is only necessary to bore a small hole from one side of the door into the 1nortiseopening and insert the keyplug therein and secure it in place in the lock by means which are operated from the edge plate.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

I. In a mortise lock, the combination with the lock-case containing the locking mechanism of an independent revoluble key-plug removably attached to the lock-case and provided at its inner end, with a bearing for ro tating in said lock-case and, at its outer end, with a bearing to engage with an independent escuteheon or sleeve, substantially as described.

2. In a lnortise lock, the combination with the lock case containing the locking mechanism, of an independent key plug or cylinder having bearings in the lock case and formed with an annular groove, a slide supported on the lock case and adapted to engage said groove for holding the key plug in position, and means carried by the edge plate for operating the slide, substantially as set forth.

The combination with a lock case containing the locking mechanism of an independent key plug or cylinder having bearing in the lock case, an annular groove in the key plug, a slide adapted to engage in the annular groove for holding the key plug in position, and the screw seated in the ec ge plate and engaging the slide for holding it into engagement with the key plug, substantially as set forth.

4. The combination with a lock case containing the locking mechanism, of a key plug having bearing in said lock ease, an annular groove in said key plug, a slide movably attached to the lock case and adapted to engage in said annular groove for holding the key plug in position, a spring for moving the slide out of engagement with the key plug, and a set-screw for holding the slide into engagement, substantially as set forth.

5. The combination with a lock case containing locking mechanism, and an independent key-plug attached to said lock case, and an independent escutcheon plate loosely surrounding the key-plug and provided with a projecting sleeve which is adapted to be let into the wood and which serves as a guide for the key-plug, thereby rendering the lock adjustable for different thicknesses of wood.

FRANK W. MIX. l'Vitn esscs:

SCHUYLER MERnrr'r, GEO. E. WHITE. 

